package com.itheima.example;

public class Example18 {
    public static void main(String[] args) {
        System.out.println("**********1.添加**********");
        add();
        System.out.println("**********2.删除**********");
        remove();
        System.out.println("**********3.修改**********");
        alert();
    }

    public static void alert() {
        StringBuffer sb = new StringBuffer("abcdefg");
        sb.setCharAt(2, 'h');
        System.out.println("修改指定位置字符结果:"+sb);
        sb.replace(1, 3, "yy");
        System.out.println("修改指定位置字符(串)结果:"+sb);
        System.out.println("字符串翻转结果:"+sb.reverse());
    }

    public static void remove() {
        StringBuffer sb = new StringBuffer("abcdefg");
        sb.delete(2, 4);
        System.out.println("删除指定位置结果:"+sb);
        sb.deleteCharAt(3);
        System.out.println("删除指定位置结果:"+sb);
        sb.delete(0,sb.length());
        System.out.println("清空缓冲区结果:"+sb);
    }

    public static void add() {
        StringBuffer sb = new StringBuffer();
        sb.append("abcdefg");
        System.out.println("append添加结果:"+sb);
        sb.insert(3, "321");
        System.out.println("insert结果:"+sb);
    }
}
